Fig. 6From: Prognostic significance of blood-based PD-L1 analysis in patients with non-small cell lung cancer undergoing immune checkpoint inhibitor therapy: a systematic review and meta-analysisForest plots of the correlation between exoPD-L1 and PFS in patients undergoing ICI therapy. a: exoPD-L1 expression versus PFS; Wang (2022a) represented the pre-treatment data with mono-immunotherapy; Wang (2022b) represented the pre-treatment data with combination immunotherapy; Wang (2022c) represented the upregulation in the post-treatment data with mono-immunotherapy; Wang (2022d) represented the upregulation in the post-treatment data with combination immunotherapy. b: Subgroup analysis of exoPD-L1 (pre-treatment and post-treatment dynamic changes) and PFS after different treatment durationsBack to article page